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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daca4b01790910ccc1c0af6f86222c87c347302b0dbf8c4a4a0001d2e55c8e86' 
  AND token = 'qMz5HHXmhZ+LHTEZspqVJM3MD98sBfUBuN61lfdt9UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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