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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd358ef90bc05a4eed7c9a5ef0377ffc085bc250f110320a71846cf5248d6b231' 
  AND token = 'A9foNoR3p1xao+3yR2aoLU3T1mAChVN7cKGJytBn6Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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