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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83adce3c558ad214fa31cd446550616813da296969ae51dca800a0069349cf1' 
  AND token = 'gv/PxJmvzNT7ZJUtHWhED0F8RO4/f07vM0i7mPCIGhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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