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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0daf7b275a18edd6b6a3917fe847bbe4268df7042d3f45ca11996670c0565b0' 
  AND token = 'Da9o8nYA7n6u1QAHa+0zqPhQ6jpcUSmuFmw0/4JT4dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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