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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa817a80910b67456cbeeb2ee220fdbfe5894fdf3e7f2a13320d69c0ab38f9c' 
  AND token = '1X4LPe6AvhU9oofBbblMmH/EXoEmk4TQLXa4AoX9/jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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