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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63eb8e6a786208e4295792130957d6b30e2ad1e09d77b3e2f73762e61b0b5d47' 
  AND token = 'VEuq6hDc9I3Z+Jj1FRsObvGTy6tauQNTWhjqGxQpIBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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