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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fee3620ce91571d5c6357e7e7e96535688cfa7f03c251d088beb7f2e57d725' 
  AND token = 'WrmmtEEU02FPBYXyELfUAOh3a987fYwOe52Tqc3mQzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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