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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b701b4a317a2976bb98e64e5b2aceb82ea1b3a7ce368e8b932e611ad1559db2' 
  AND token = 'rRgotNNd7cuKABj4A/cITDYdq9REUCa9xxwxbvZ0zVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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