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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efafd39f720c672889742be043bf2e8a12758d4031d8049a73a13657d809821d' 
  AND token = '7ZCdhzu7cmLEQg/YpNuMiW87PMW48iu/zh1uX38t2Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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