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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea851010f82152d64ca2f27a4818a472e9a5450886aeba682f5dc1ba798a09df' 
  AND token = 'aABq9Abmny16jWtrmliOSQ9PpYjbTvCMlpmZX4yW3cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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