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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd69da5961a5e49d11a7491baedef4af46d0d6b380e836fba49a22751ff131a1' 
  AND token = 'sDCvmtd1uqOtJFc8cnN/AwVJ4io7gyGy/W4r6mZCVEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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