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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9392ac84314cfefa66e5968275e51bb289d0cd048e3260591efc152cb6c9f9' 
  AND token = '53MCRsuSllV1NKb0vB/WUBk0bUSgfwzlGElKd1EkZFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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