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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9bf099c3b3c33f643d27120d0ad89cab7870e1be907acaf5f608ccf129d4b9' 
  AND token = 'NaqC/dQqFAVYQ1d7bgZ6lmFaQ/vF1ZyE2GajHsL8nF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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