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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2e221020d79692c413160459f54377b9c4f3a43c2be94437a5c0b6d3b3aecc' 
  AND token = '1m6EgjRlIF34yMgGBKl2+0r7GAPGSs/V8JhAdqqc52o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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