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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abb0c2102405c3569f1e3d5d3be42c6f0c36fbbe2c2a057f86b1015dcd3c3dd' 
  AND token = 'qyw/l/DGIzMD7bvzqCQr6GNElVgthEGHRsDkhm8VChc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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