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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe0e3338505c78308a21f73a3826a6af9a80412ade1e7ecf2828bbfb003666c' 
  AND token = 'nxuo64P1mNT7Ei1WuTkQEFShdiVqRNq5A4ZZNvn+29k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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