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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d19e29620040efe3a049637d343e8e9c936d5a5723e15a1ad297a469d76357' 
  AND token = 'shzn9mTF/9wXBNHtyz08nzqH7Saoqp5Ws8IH5mVCRN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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