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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25bd1beafefc30d954fef79eb7f462715fad74bf40adce319c190ef53616914d' 
  AND token = 'LZY5P8bNi+URAY+fPzem+8MyjSQF0CBNcMx88Yg6Jd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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