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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf518b6d7368dddeb209604aad49c121b1b82bb7d9401410f69f1e2f310e3c8' 
  AND token = 'a6PD/w5baB9KvGUJAwAxYUeWC4iYveILQISr14FBG7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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