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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f319400e19cb1c8609818868fb5596c8d1fa99fb666fd8739538d169e4f48003' 
  AND token = 'qL5WM/Z3Q55JZVStW8bJ5ybtNOrfPUL4TL6JsG3wo98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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