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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8384ebae7402bcee2cb6ccfb945168195d00f6e7f2fcf3f4e664d59a42e3d664' 
  AND token = 'veUMi2rRe6B0Xz7FpR91H6FxwlSOJz/Ac9wB+sIZdgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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