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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fce4698b7721aafa0afae6a1cda365376f5dcfa152ad165e4914a41f74c88cc' 
  AND token = '21jlL9iJdTfl3SgUAi4+HcSFe5V0/t0mHNgTxJw7UtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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