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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34dca18041f6e5d57b95ae44954ea4dec879cb9e684d122e3201989f23c7298f' 
  AND token = 'Ljym+h02Rd/0pGUNNAAQs42TSso6KjVVgKSn0XuOU94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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