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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1de6d2da9c1dfbc87b2b7a3bb5be7681cac8ab80a4018b72e24ed7bad74deb1' 
  AND token = '0bnHkQzlfvA0hpEB9aO1d3hJF19sTfJsuLI4NSrDV9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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