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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6155941766c33ec0b701a6fe6219655376fa62c28440171ed31214dc1ecda424' 
  AND token = 'x+m+lWexaoQ3+OSBUbinTTfEhmMGjss+8lxCAvxwKug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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