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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9f0b63f88d4a298515b2961a22e619ed55fc331bc81cb3223175f7a2e84b83' 
  AND token = 'PJE7+eo1jTdMV6j3Of643TOlU6Yk7GSt/p1v1v5bVD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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