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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b6d12d08b7f99c89e0e36924960b80ca2944b0e8d4e27ec6f55f50b594f7ef' 
  AND token = 'yT/olDJgu/7zBRrIMlHmNaPXi2SFV2t/A60RThL3iTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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