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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc55ab831354c3109357fc249552a0c5556f4b37919d7e405c16991fa4c6dd9' 
  AND token = 'lPjEWUbRddbMm9TfGy5vBfulwNQ/xIWHAjT9Gv454Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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