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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719857deccaaf21f7283e1834adc74a8347d857befc11739bfe246d6fce6ff27' 
  AND token = 'PE7NVC9sAYM3NNz9NUK9AMlOEQMInqZ/x0HWEdf89OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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