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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c155b2a58acf40841968bbfe6594a8048ccc00994c62999dfc2e6fdcacee1b' 
  AND token = '95ohwXEZ/5ZPmtN3UHxxUgU85s3StD6Xdn/2FS/P+xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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