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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6954bf4f12a62e775ca5d8bbbe1d17ef7d4d6274af5b6ddb43520a1e67a4937a' 
  AND token = 'ujynqi7EMIjxFSOZ7XTZqKtRusEoGLQXGJ6ypvGhccE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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