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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360f25f06677bb01b4986fb20294092af322f8f560f682c374dc3842ac2c348b' 
  AND token = 'aZ6xlL4+nPm2CqvC5FeUkHAuwbSh4tEzFivwCgATQVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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