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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f52e8720f66527c93869028f3cefe52ccdfe6cfe9a4896c4193ee8ff09f007' 
  AND token = 'VG20c6i/OqljWOKFu5uVpf5HX18DP3MOEhGbK9sbzSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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