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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1d937071440d14f8b34b3352cc54ba2d2107dc72ec8324e431fced2e12db89' 
  AND token = 'fNWDym88AfJKqkn6xHoCNOOkpbimGZLEhwBMyW9a5P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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