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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bc4ba72720e9c16893021283d46643133cc64b9270d2c96ac9fa11a1a2241f' 
  AND token = 'AUTmp2hVEHNza/wQsVf5+3jGslsXmQoZe8R50tc99XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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