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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0cdcc9578492ddfaff41bf8cdcab5d086c33a45c1124bc77418d103d27f0c9' 
  AND token = 'fu3f5yWHgQjUh3g8pT0UQIktDGL3znVmMiCm3qEz/ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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