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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7105f7cbb67d0a88faae65d32962cf5a8a1e622a3db2f7d08b817c78dc86b2cc' 
  AND token = 'Q/P3TwaV6AmypuoZRgZ6IU1KETRZY4rOU8nWHbNvVRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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