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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9c8f0fbd62b8b6d052aa3a8bce73ee9a989d6361901f86356b7126a3097788' 
  AND token = '/PK4u3hMuUKdnRIPdONwhUrIOOhDq0NVZwQUuP0BWGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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