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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd775dc57ff1b5fa481cf2c133334d68c69251bf6f9b92d69f7adfa74925a570' 
  AND token = 'sUxOnwRr4jSAuTi+McuaaqeuPp0cTfhiR53+Vh0bAWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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