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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5d54abe158a07b9ab04fca6b22dffc8a28bf332a3689dd97837505296953e2' 
  AND token = 'pNNd2S5YUTgIl2rFeSmY7BtXiwsY6O3VYwC55voUXFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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