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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1990289ad09a4d9f4e63acdb8724fd2375de43738c43bcb8b533c9f3e5ae5281' 
  AND token = 'G45biSMiFLP9CVRWWPuQYZjw5Ww6+Xevzx5E7cscbXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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