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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0a90629545fced878e3eae5d227b75b61df06faf380f92f96226e92cf50adf' 
  AND token = 'jbHamW3W/00NGfRD04a4GV2XBXr5JGR2TJ4RRGUcQpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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