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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '501fc6b54529b58dd4549fffa1ae3fb871ec8d02d8de008f6ed09904c2117dd8' 
  AND token = 'FpPerRvIhPofpoje0WLiyeamLzB5evgilR+ubZuoYhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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