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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e36e60e4268c1ddd263b8eee3626df656da1d29951d00fd72d556f581376ff' 
  AND token = 'fxiNGjFrbHzve8xovomSk1fADQuS/2IyR9zOgZnLIDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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