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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10fce3c3807fc5c8e3190ab9bb350082c7b76ed7b008c23e143034531776544f' 
  AND token = 'lvJd+32582LUYU8MyBxnUISwS2jsBG2ncrXZJGvp4lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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