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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e355ef3436364de31689ed65c0e9712e56d865aa59703633479aa92277e9962' 
  AND token = 'OiOhiJ/xHEzb+PTyKITbH1h1zTRWr8YUrlJ+EHOjUdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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