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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c92d3d5cc0426f5d7dcf35c55cc9475c8bcbfe6496ca6047d579cc84ee7aef2' 
  AND token = 'fixl+w8Bwe3ZfwqB1qknhPNP3M0pDmRakxfGzlpCTc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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