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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94083d49a500875da5aecbed5860f0db048600556372360ea593d20a0fd7fd16' 
  AND token = '34ZFp25/x+8bW5yxQ4KKJ6d8EkcJhK/+wNrF+mSVT0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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