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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb4f9b2fc40136b9d92b8c1f3281faf0db155b71453d5d3bf34141092aa0cbc' 
  AND token = 'fUW32xuOLDlSyfkpiHXi7mPwwdJ10dSYx/qanM/m7u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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