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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef897c618e8c7050f4d6e39d33f0d875016b2e9088e308554f6045e0b66ca46f' 
  AND token = 'qf6KFQJlO5XvKaUi1mVW/+ZIqEhS3Skcp+1F/2EVeIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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