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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd14b80f0cf4d196d47a7781c2b4c83235bb1a596b542e3770ad3c861ab9146' 
  AND token = 'yYjlO4m+pawFAFbRR5FEy7g9HQPFEWm41Mn9+oHpktc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}