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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f962fa3825bedf8a70547d2ba3c0c97a7c9b165c295c062e77f43fbf5d39ec' 
  AND token = 'CJu+1JjFkaTC6lMaFgNobygSA9C1pD9csEc13CZPIVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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