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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0cf6dba0599d027a33a24d6148aa5bbb617a3076d135841b003e691c4d0366' 
  AND token = 'kPr1ZY/ipp+7E4XjUAOyLaN/oGU90vUKE6OfgD0GG9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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