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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b73bcc054fd7ab36fd4320899fccf8b015974ade8b40c835e736cc38f4261b7' 
  AND token = 'jXn9doyOL92qiIYaKnSG+4SF1ALHVKvFbasSdnjRFMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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