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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742fc296596dc8db33b8e5024a803bf07d8b900f8ee45d04ac7dd9ab15069028' 
  AND token = 'nBlsyAYFu7jR8VQPZUEhtEMzdCuB3/Mr7gECggW76Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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