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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c861ab6a9b7007d3e78d5e6df93e5f6371f065a5dca6364bd9962d4f7990c730' 
  AND token = '0j79AH2No/44QtRbIosryL7CaPE/RXihGu7IF6j/bCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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