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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc4f59b542c6b67916283f0f3756a4f678f298d8814bdc6a77dfcae3b7db33c' 
  AND token = 'q3N4OmG9m7QBaP3P5207akcqpB0l4c0fMdzFK0BqnYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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