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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c000c2af6b36338c482a027210e5914c74f92401eeb4eeb7f30fc479c10584b' 
  AND token = 'v8HFbVF+aRSLaAOrKNEL0e1swwilrjuwFVG7ynnFUUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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