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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e9742ba1d8524208975bbf5fe0e75cc7538b63cca6d1e5827b709a4e0d7367' 
  AND token = 'Gng5tE1i2R9mQxTHugpzx8sNA1RH32GDMX3kBg8X/iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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