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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240b768c256a81a8b779bdb563d0a69a346cfbbd2349e9df5d18017638f41bed' 
  AND token = 'W2R6SDTdVzRkz94S5cWBnmRDhXphAn8TatIj+iHB7P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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