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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0863ccbcd6bc758cb6b8527f381cdcdb4323b8e3d0848d5972b05ffb737c874c' 
  AND token = 'q7jIVs8S2PtVYBMZWLTsmaE12W0QlgEg9ajtLdLkGbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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