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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed742ca5be08ad71b9652c1bd567c19bb49344ec7e8859ddd60e17c95ba8187c' 
  AND token = '7s4V/y3fE9Dj6VxlENKWuXxbkrX8buFY0b+AftLH0FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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