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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bffe4962ce0b8e9dec21e451811232458b6695e2369bf0489e7d87a4e28f4b' 
  AND token = 's5VHBnPApwX1YzVUzixLp4KeXALD6iD67GQvU6edCyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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