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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7a4c9b1747fc7ef90a8bc47b1b377e386b95c090290272ce3ace04a1e906ed' 
  AND token = 'NhCkPK1tsjmMgj56KFjultEm5iYA6s3zIVq6O6yJ3rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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