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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad75b209db31e0fce3159cff940b62a648de6ef382a1b8e78b339ec8d128233c' 
  AND token = 'LF1xt1rAxLzhP8TDU65y8qauydTh3QycNg6ngcoaSsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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